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                                                                    DA 11-250

                                                             February 9, 2011

                                             Enforcement Advisory No. 2011-04


   CONSUMERS BEWARE: It is Unlawful to Use "Cell Jammers" and Other Equipment

   that Blocks, Jams, or Interferes  with Authorized Radio Communications in
                                    the U.S.

   In recent years, the number of websites offering "cell jammers" or similar
   devices designed to block communications and create a "quiet zone" in
   vehicles, schools, theaters, restaurants, and other places has increased
   substantially. While these devices are marketed under different names  -
   such as signal blockers, GPS jammers, or text stoppers  - they have the
   same purpose. We remind consumers that it is a violation of federal law to
   use devices that intentionally block, jam, or interfere with authorized
   radio communications such as cell phones, police radar, GPS, and Wi-Fi. 
   Despite some marketers' claims, consumers cannot legally use cell and GPS
   jammers within the United States, nor can retailers lawfully sell them.

   Why are jammers prohibited?  Use of jamming devices can place you or other
   people in danger. For instance, jammers can prevent 9-1-1 and other
   emergency phone calls from getting through or interfere with law
   enforcement communications (ambulance, fire, police, etc). In order to
   protect the public and ensure access to emergency and other communications
   services, without interference, the FCC strictly prohibits the use,
   marketing, manufacture, and sale of jammers.

   What happens if you use a jammer?  Operation of a jammer in the United
   States is illegal and may subject you to substantial monetary penalties,
   seizure of the unlawful equipment, and criminal sanctions including
   imprisonment.  Therefore, this advisory emphasizes the importance of
   strict compliance with the legal prohibition against jammers.

   Need more information? To file a complaint, visit
   or call 1-888-CALL-FCC. For additional information regarding enforcement
   of the jamming prohibition, visit or
   contact Kevin Pittman or Neal McNeil of the Enforcement Bureau at (202)
   418-1160 or Media inquiries should be directed to
   David Fiske at (202) 418-0513 or

   To request materials in accessible formats for people with disabilities
   (Braille, large print, electronic files, audio format), send an e-mail to or call the Consumer & Governmental Affairs Bureau at (202)
   418-0530 (voice), (202) 418-0432 (TTY). You may also contact the
   Enforcement Bureau on its TTY line at (202) 418-1148 for further
   information about this Enforcement Advisory, or the FCC on its TTY line at
   1-888-TELL-FCC (1-888-835-5322) for further information about the jamming

   Issued by: Chief, Enforcement Bureau

   See 47 U.S.C. S: 333 (prohibiting willful or malicious interference with
   the radio communications of any station licensed or authorized under the
   Communications Act or operated by the United States Government); 47 U.S.C.
   S: 301 (requiring persons operating or using radio transmitters to be
   licensed or authorized under the Communications Act and the Commission's

   See 47 U.S.C. S:S: 401, 501, 503, 510.

                                  Page 1 of 2


                                  Page 1 of 1

                            FCC ENFORCEMENT ADVISORY

   Federal Communications Commission

   445 12th St., S.W.

   Washington, D.C. 20554

                                        News Media Information 202 / 418-0500


                                                          TTY: 1-888-835-5322